Please explain why Thanks 1 You can see a blender creating a

Please explain why! Thanks

1 You can see a blender creating a turbulent vortex in water here: http://youtube.com/watch?v=vk5Y6dRheFw If you were to run the blades at very low speeds, the water would flow laminarly. This would NOT be good for mixing ingredients. At some speed, the water begins to break up into chaotic vorteces. If you were to replace the water with a more viscous oil (but which has the same density!), this transistion to turbulence would occur at a blade speed which is

faster than before

slower than before

the same as before

impossible to know.

2 In the previous question, if you were to find a fluid with the same viscosity as water, but with higher density, then this transition to turbulence would occur at

a higher blade speed than before

a slower blade speed than before

the same blade speed as before

impossible to know.

3To see the effect of magnus forces in Soccer, look at

http://youtube.com/watch?v=RRqS-dKXHEM

4 If you are facing the goal, in order to get the ball to curve to the left which side of the soccer ball as it spins should be approaching you?

top

bottom

left

right

In the previous question, as you see the ball go into the goal curving left, which way should air be deflected by the spinning ball?

right

left

up

down

Solution

1. As viscosity( dynamic viscosity) increases kinematic viscosity also increases for same density

option a faster than before

2.a slowerr blade speed than before

3. spins right

4. wind direction left